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January 25, 2015

January 25, 2015

Posted by **Rae Rae** on Sunday, April 5, 2009 at 4:50pm.

Directions: Factor each polynomial. If the polynomial cannot be factored, write prime.

1. a^2-16b

Answer: (a-16)(a+16)

2. m^2+8m+16

Answer: (m+8)^2

3. 3a^2b+6ab+9ab^2

Answer: Prime

4. 2r^2+3r+1

Answer: Prime

5. z3+6z^2+9z

Answer: Prime

- Algebra Correction -
**Rae Rae**, Sunday, April 5, 2009 at 4:53pmFor #1 I meant to put (a-4)(a-4)

- Algebra Please check answers -
**Rae Rae**, Sunday, April 5, 2009 at 4:54pmSorry I meant (a-4)(a+4)

- Algebra Please check answers -
**Reiny**, Sunday, April 5, 2009 at 4:55pm#3, I see a common factor

3ab(a + 2 + 3b)

#4, (2r+1)(r+1)

#5 common factor

z(z^2 + 6z + 9), now I see a perfect square

= z(z+3)^2

- Algebra Please check answers -
**Damon**, Sunday, April 5, 2009 at 4:55pm1. a^2-16b

Answer: (a-16)(a+16)

Yes !!!

2. m^2+8m+16

Answer: (m+8)^2

8 times 8 is 64, not 16

4 times 4 is 16

3. 3a^2b+6ab+9ab^2

Answer: Prime

3ab (a + 2 + 3b)

4. 2r^2+3r+1

Answer: Prime

(2r+1)(r+1)

5. z3+6z^2+9z

Answer: Prime

z (z^2 + 6 z + 9)

z (z+3)(z+3)

- Algebra Please check answers -
**Reiny**, Sunday, April 5, 2009 at 4:57pmneither of your corrections for #1 gives you back the original result if expanded.

a^2-16b does not factor, unless you meant

a^2-16b^2, then it would be (a+4b)(a-4b)

- Algebra Please check answers -
**Damon**, Sunday, April 5, 2009 at 4:59pmI did not see that b there !

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